21435624413 has 16 divisors (see below), whose sum is σ = 24854480640. Its totient is φ = 18106166400.

The previous prime is 21435624403. The next prime is 21435624493. The reversal of 21435624413 is 31442653412.

It is a de Polignac number, because none of the positive numbers 2^k-21435624413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435624403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1204343 + ... + 1222011.

It is an arithmetic number, because the mean of its divisors is an integer number (1553405040).

Almost surely, 2^21435624413 is an apocalyptic number.

It is an amenable number.

21435624413 is a deficient number, since it is larger than the sum of its proper divisors (3418856227).

21435624413 is a wasteful number, since it uses less digits than its factorization.

21435624413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20188.

The product of its digits is 69120, while the sum is 35.

The spelling of 21435624413 in words is "twenty-one billion, four hundred thirty-five million, six hundred twenty-four thousand, four hundred thirteen".